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Two-dimensional heterometallic CuIILnIII (Ln = Tb and Dy) coordination polymers bridged by dicyanamides showing slow magnetic relaxation behavior.
- Source :
- CrystEngComm; 9/14/2019, Vol. 21 Issue 34, p5145-5151, 7p
- Publication Year :
- 2019
-
Abstract
- Using dicyanamides, three two-dimensional coordination polymers (CPs) [Cu<superscript>II</superscript>(valdmpn)Ln<superscript>III</superscript>(μ-1,5-dca)<subscript>3</subscript>]<subscript>n</subscript> (Ln<superscript>III</superscript> = Gd (1), Tb (2) and Dy (3)) were synthesized and characterized. Compounds 1–3 are two-dimensional coordination polymers bridged with μ-1,5-dca connecting the [Cu<superscript>II</superscript>(valdmpn)Ln<superscript>III</superscript>]<superscript>3+</superscript> units. In compounds 1–3, the Cu atom was pentacoordinated with an elongated square pyramidal (C<subscript>4v</subscript>) geometry, while the Ln (Gd, Tb and Dy) atom was nine-coordinated with a muffin (C<subscript>s</subscript>) geometry. Detailed direct current (dc) magnetic measurements and simulated data demonstrated the existence of a ferromagnetic Cu<superscript>II</superscript>–Gd<superscript>III</superscript> interaction for compound 1. Alternating current (ac) magnetic measurements revealed that compound 2 exhibited a slow magnetic relaxation behavior under a zero dc field. A hysteresis loop at 1.8 K was observed in compound 2, characteristic of typical single-molecule magnets (SMMs). However, compound 3 showed a slow magnetic relaxation behavior under a dc field. This system provides a good opportunity to determine the character of the Ln(III) ions incorporated and/or the origin of the slow magnetic relaxation behavior. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14668033
- Volume :
- 21
- Issue :
- 34
- Database :
- Complementary Index
- Journal :
- CrystEngComm
- Publication Type :
- Academic Journal
- Accession number :
- 138294343
- Full Text :
- https://doi.org/10.1039/c9ce00673g